SPIROCH^T^ 



373 



Spirochaeta (Leptospira) IcterohsemorrhagisB,.— This orgatiism 

 ■was discovered by Inada and Ido^ in the human disease knowreas 

 infectious jaundice or Weil's disease. The organism is a long 

 slender somewhat irregular spiral. It occurs in the blood and in 

 greater abundance in the substance of the kidney. It grows as 





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y 



f' 



n 



y^ 



Pig. 147. — Leptospira icterohemorrhagice in section of human liver. Drawing of 

 a silver-impregnated specimen. (After Inada, Ida, Hoki, Kaneko and Ilo.) 



an aerobe in diluted rabbit serum at temperatures ranging from 

 10° to 37° C, which suggests that insects may act as reservoirs 

 for the v;rus.^ Wild rats frequently harbor the parasite within 

 their kidneys and excrete it with the urine. The mode of transfer 



' Inda, Ido, Hoki, Kaneko and Ito: Journ. Exp. Med. 1916, 23, p. 377. 

 2 Noguchi: Journ. Exp. Med., 1918, 27, pp. 575, 593, 609. 



